{"cve":"CVE-2026-33538","nvd":{"published":"2026-03-24T19:16:54.673","modified":"2026-06-17T10:37:40.533","status":"Analyzed","description":"Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.58 and 9.6.0-alpha.52, an unauthenticated attacker can cause denial of service by sending authentication requests with arbitrary, unconfigured provider names. The server executes a database query for each unconfigured provider before rejecting the request, and since no database index exists for unconfigured providers, each request triggers a full collection scan on the user database. This can be parallelized to saturate database resources. This issue has been patched in versions 8.6.58 and 9.6.0-alpha.52.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400"],"references":["https://github.com/parse-community/parse-server/commit/40eb442e02672986730007d0a1edb22c1c4bd357","https://github.com/parse-community/parse-server/commit/fbac847499e57f243315c5fc7135be1d58bb8e54","https://github.com/parse-community/parse-server/pull/10270","https://github.com/parse-community/parse-server/pull/10271","https://github.com/parse-community/parse-server/security/advisories/GHSA-g4cf-xj29-wqqr"],"products":["parseplatform:parse-server"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-33538","score":0.00422,"percentile":0.36535,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-g4cf-xj29-wqqr","url":"https://osv.dev/vulnerability/GHSA-g4cf-xj29-wqqr","summary":"Parse Server: Denial of Service via unindexed database query for unconfigured auth providers","modified":"2026-03-27T22:03:47.941344Z","packages":[{"ecosystem":"npm","name":"parse-server","purl":"pkg:npm/parse-server","ranges":[">=9.0.0 <9.6.0-alpha.52"],"fixed":["9.6.0-alpha.52"]},{"ecosystem":"npm","name":"parse-server","purl":"pkg:npm/parse-server","ranges":["<8.6.58"],"fixed":["8.6.58"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}